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5368 lines (4371 loc) · 156 KB
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//------------------------------------------------------------------------------
// File: AMFilter.cpp
//
// Desc: DirectShow base classes - implements class hierarchy for streams
// architecture.
//
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
//=====================================================================
//=====================================================================
// The following classes are declared in this header:
//
//
// CBaseMediaFilter Basic IMediaFilter support (abstract class)
// CBaseFilter Support for IBaseFilter (incl. IMediaFilter)
// CEnumPins Enumerate input and output pins
// CEnumMediaTypes Enumerate the preferred pin formats
// CBasePin Abstract base class for IPin interface
// CBaseOutputPin Adds data provider member functions
// CBaseInputPin Implements IMemInputPin interface
// CMediaSample Basic transport unit for IMemInputPin
// CBaseAllocator General list guff for most allocators
// CMemAllocator Implements memory buffer allocation
//
//=====================================================================
//=====================================================================
#include "streams.h"
#include <strsafe.h>
#ifdef DXMPERF
#include "dxmperf.h"
#endif // DXMPERF
//=====================================================================
// Helpers
//=====================================================================
STDAPI CreateMemoryAllocator(__deref_out IMemAllocator **ppAllocator)
{
return CoCreateInstance(CLSID_MemoryAllocator,
0,
CLSCTX_INPROC_SERVER,
IID_IMemAllocator,
(void **)ppAllocator);
}
// Put this one here rather than in ctlutil.cpp to avoid linking
// anything brought in by ctlutil.cpp
STDAPI CreatePosPassThru(
__in_opt LPUNKNOWN pAgg,
BOOL bRenderer,
IPin *pPin,
__deref_out IUnknown **ppPassThru
)
{
*ppPassThru = NULL;
IUnknown *pUnkSeek;
HRESULT hr = CoCreateInstance(CLSID_SeekingPassThru,
pAgg,
CLSCTX_INPROC_SERVER,
IID_IUnknown,
(void **)&pUnkSeek
);
if (FAILED(hr)) {
return hr;
}
ISeekingPassThru *pPassThru;
hr = pUnkSeek->QueryInterface(IID_ISeekingPassThru, (void**)&pPassThru);
if (FAILED(hr)) {
pUnkSeek->Release();
return hr;
}
hr = pPassThru->Init(bRenderer, pPin);
pPassThru->Release();
if (FAILED(hr)) {
pUnkSeek->Release();
return hr;
}
*ppPassThru = pUnkSeek;
return S_OK;
}
#define CONNECT_TRACE_LEVEL 3
//=====================================================================
//=====================================================================
// Implements CBaseMediaFilter
//=====================================================================
//=====================================================================
/* Constructor */
CBaseMediaFilter::CBaseMediaFilter(__in_opt LPCTSTR pName,
__inout_opt LPUNKNOWN pUnk,
__in CCritSec *pLock,
REFCLSID clsid) :
CUnknown(pName, pUnk),
m_pLock(pLock),
m_clsid(clsid),
m_State(State_Stopped),
m_pClock(NULL)
{
}
/* Destructor */
CBaseMediaFilter::~CBaseMediaFilter()
{
// must be stopped, but can't call Stop here since
// our critsec has been destroyed.
/* Release any clock we were using */
if (m_pClock) {
m_pClock->Release();
m_pClock = NULL;
}
}
/* Override this to say what interfaces we support and where */
STDMETHODIMP
CBaseMediaFilter::NonDelegatingQueryInterface(
REFIID riid,
__deref_out void ** ppv)
{
if (riid == IID_IMediaFilter) {
return GetInterface((IMediaFilter *) this, ppv);
} else if (riid == IID_IPersist) {
return GetInterface((IPersist *) this, ppv);
} else {
return CUnknown::NonDelegatingQueryInterface(riid, ppv);
}
}
/* Return the filter's clsid */
STDMETHODIMP
CBaseMediaFilter::GetClassID(__out CLSID *pClsID)
{
CheckPointer(pClsID,E_POINTER);
ValidateReadWritePtr(pClsID,sizeof(CLSID));
*pClsID = m_clsid;
return NOERROR;
}
/* Override this if your state changes are not done synchronously */
STDMETHODIMP
CBaseMediaFilter::GetState(DWORD dwMSecs, __out FILTER_STATE *State)
{
UNREFERENCED_PARAMETER(dwMSecs);
CheckPointer(State,E_POINTER);
ValidateReadWritePtr(State,sizeof(FILTER_STATE));
*State = m_State;
return S_OK;
}
/* Set the clock we will use for synchronisation */
STDMETHODIMP
CBaseMediaFilter::SetSyncSource(__inout_opt IReferenceClock *pClock)
{
CAutoLock cObjectLock(m_pLock);
// Ensure the new one does not go away - even if the same as the old
if (pClock) {
pClock->AddRef();
}
// if we have a clock, release it
if (m_pClock) {
m_pClock->Release();
}
// Set the new reference clock (might be NULL)
// Should we query it to ensure it is a clock? Consider for a debug build.
m_pClock = pClock;
return NOERROR;
}
/* Return the clock we are using for synchronisation */
STDMETHODIMP
CBaseMediaFilter::GetSyncSource(__deref_out_opt IReferenceClock **pClock)
{
CheckPointer(pClock,E_POINTER);
ValidateReadWritePtr(pClock,sizeof(IReferenceClock *));
CAutoLock cObjectLock(m_pLock);
if (m_pClock) {
// returning an interface... addref it...
m_pClock->AddRef();
}
*pClock = (IReferenceClock*)m_pClock;
return NOERROR;
}
/* Put the filter into a stopped state */
STDMETHODIMP
CBaseMediaFilter::Stop()
{
CAutoLock cObjectLock(m_pLock);
m_State = State_Stopped;
return S_OK;
}
/* Put the filter into a paused state */
STDMETHODIMP
CBaseMediaFilter::Pause()
{
CAutoLock cObjectLock(m_pLock);
m_State = State_Paused;
return S_OK;
}
// Put the filter into a running state.
// The time parameter is the offset to be added to the samples'
// stream time to get the reference time at which they should be presented.
//
// you can either add these two and compare it against the reference clock,
// or you can call CBaseMediaFilter::StreamTime and compare that against
// the sample timestamp.
STDMETHODIMP
CBaseMediaFilter::Run(REFERENCE_TIME tStart)
{
CAutoLock cObjectLock(m_pLock);
// remember the stream time offset
m_tStart = tStart;
if (m_State == State_Stopped){
HRESULT hr = Pause();
if (FAILED(hr)) {
return hr;
}
}
m_State = State_Running;
return S_OK;
}
//
// return the current stream time - samples with start timestamps of this
// time or before should be rendered by now
HRESULT
CBaseMediaFilter::StreamTime(CRefTime& rtStream)
{
// Caller must lock for synchronization
// We can't grab the filter lock because we want to be able to call
// this from worker threads without deadlocking
if (m_pClock == NULL) {
return VFW_E_NO_CLOCK;
}
// get the current reference time
HRESULT hr = m_pClock->GetTime((REFERENCE_TIME*)&rtStream);
if (FAILED(hr)) {
return hr;
}
// subtract the stream offset to get stream time
rtStream -= m_tStart;
return S_OK;
}
//=====================================================================
//=====================================================================
// Implements CBaseFilter
//=====================================================================
//=====================================================================
/* Override this to say what interfaces we support and where */
STDMETHODIMP CBaseFilter::NonDelegatingQueryInterface(REFIID riid,
__deref_out void **ppv)
{
/* Do we have this interface */
if (riid == IID_IBaseFilter) {
return GetInterface((IBaseFilter *) this, ppv);
} else if (riid == IID_IMediaFilter) {
return GetInterface((IMediaFilter *) this, ppv);
} else if (riid == IID_IPersist) {
return GetInterface((IPersist *) this, ppv);
} else if (riid == IID_IAMovieSetup) {
return GetInterface((IAMovieSetup *) this, ppv);
} else {
return CUnknown::NonDelegatingQueryInterface(riid, ppv);
}
}
#ifdef _DEBUG
STDMETHODIMP_(ULONG) CBaseFilter::NonDelegatingRelease()
{
if (m_cRef == 1) {
KASSERT(m_pGraph == NULL);
}
return CUnknown::NonDelegatingRelease();
}
#endif
/* Constructor */
CBaseFilter::CBaseFilter(__in_opt LPCTSTR pName,
__inout_opt LPUNKNOWN pUnk,
__in CCritSec *pLock,
REFCLSID clsid) :
CUnknown( pName, pUnk ),
m_pLock(pLock),
m_clsid(clsid),
m_State(State_Stopped),
m_pClock(NULL),
m_pGraph(NULL),
m_pSink(NULL),
m_pName(NULL),
m_PinVersion(1)
{
#ifdef DXMPERF
PERFLOG_CTOR( pName ? pName : L"CBaseFilter", (IBaseFilter *) this );
#endif // DXMPERF
ASSERT(pLock != NULL);
}
/* Passes in a redundant HRESULT argument */
CBaseFilter::CBaseFilter(__in_opt LPCTSTR pName,
__in_opt LPUNKNOWN pUnk,
__in CCritSec *pLock,
REFCLSID clsid,
__inout HRESULT *phr) :
CUnknown( pName, pUnk ),
m_pLock(pLock),
m_clsid(clsid),
m_State(State_Stopped),
m_pClock(NULL),
m_pGraph(NULL),
m_pSink(NULL),
m_pName(NULL),
m_PinVersion(1)
{
#ifdef DXMPERF
PERFLOG_CTOR( pName ? pName : L"CBaseFilter", (IBaseFilter *) this );
#endif // DXMPERF
ASSERT(pLock != NULL);
UNREFERENCED_PARAMETER(phr);
}
#ifdef UNICODE
CBaseFilter::CBaseFilter(__in_opt LPCSTR pName,
__in_opt LPUNKNOWN pUnk,
__in CCritSec *pLock,
REFCLSID clsid) :
CUnknown( pName, pUnk ),
m_pLock(pLock),
m_clsid(clsid),
m_State(State_Stopped),
m_pClock(NULL),
m_pGraph(NULL),
m_pSink(NULL),
m_pName(NULL),
m_PinVersion(1)
{
#ifdef DXMPERF
PERFLOG_CTOR( L"CBaseFilter", (IBaseFilter *) this );
#endif // DXMPERF
ASSERT(pLock != NULL);
}
CBaseFilter::CBaseFilter(__in_opt LPCSTR pName,
__in_opt LPUNKNOWN pUnk,
__in CCritSec *pLock,
REFCLSID clsid,
__inout HRESULT *phr) :
CUnknown( pName, pUnk ),
m_pLock(pLock),
m_clsid(clsid),
m_State(State_Stopped),
m_pClock(NULL),
m_pGraph(NULL),
m_pSink(NULL),
m_pName(NULL),
m_PinVersion(1)
{
#ifdef DXMPERF
PERFLOG_CTOR( L"CBaseFilter", (IBaseFilter *) this );
#endif // DXMPERF
ASSERT(pLock != NULL);
UNREFERENCED_PARAMETER(phr);
}
#endif
/* Destructor */
CBaseFilter::~CBaseFilter()
{
#ifdef DXMPERF
PERFLOG_DTOR( L"CBaseFilter", (IBaseFilter *) this );
#endif // DXMPERF
// NOTE we do NOT hold references on the filtergraph for m_pGraph or m_pSink
// When we did we had the circular reference problem. Nothing would go away.
delete[] m_pName;
// must be stopped, but can't call Stop here since
// our critsec has been destroyed.
/* Release any clock we were using */
if (m_pClock) {
m_pClock->Release();
m_pClock = NULL;
}
}
/* Return the filter's clsid */
STDMETHODIMP
CBaseFilter::GetClassID(__out CLSID *pClsID)
{
CheckPointer(pClsID,E_POINTER);
ValidateReadWritePtr(pClsID,sizeof(CLSID));
*pClsID = m_clsid;
return NOERROR;
}
/* Override this if your state changes are not done synchronously */
STDMETHODIMP
CBaseFilter::GetState(DWORD dwMSecs, __out FILTER_STATE *State)
{
UNREFERENCED_PARAMETER(dwMSecs);
CheckPointer(State,E_POINTER);
ValidateReadWritePtr(State,sizeof(FILTER_STATE));
*State = m_State;
return S_OK;
}
/* Set the clock we will use for synchronisation */
STDMETHODIMP
CBaseFilter::SetSyncSource(__in_opt IReferenceClock *pClock)
{
CAutoLock cObjectLock(m_pLock);
// Ensure the new one does not go away - even if the same as the old
if (pClock) {
pClock->AddRef();
}
// if we have a clock, release it
if (m_pClock) {
m_pClock->Release();
}
// Set the new reference clock (might be NULL)
// Should we query it to ensure it is a clock? Consider for a debug build.
m_pClock = pClock;
return NOERROR;
}
/* Return the clock we are using for synchronisation */
STDMETHODIMP
CBaseFilter::GetSyncSource(__deref_out_opt IReferenceClock **pClock)
{
CheckPointer(pClock,E_POINTER);
ValidateReadWritePtr(pClock,sizeof(IReferenceClock *));
CAutoLock cObjectLock(m_pLock);
if (m_pClock) {
// returning an interface... addref it...
m_pClock->AddRef();
}
*pClock = (IReferenceClock*)m_pClock;
return NOERROR;
}
// override CBaseMediaFilter Stop method, to deactivate any pins this
// filter has.
STDMETHODIMP
CBaseFilter::Stop()
{
CAutoLock cObjectLock(m_pLock);
HRESULT hr = NOERROR;
// notify all pins of the state change
if (m_State != State_Stopped) {
int cPins = GetPinCount();
for (int c = 0; c < cPins; c++) {
CBasePin *pPin = GetPin(c);
if (NULL == pPin) {
break;
}
// Disconnected pins are not activated - this saves pins worrying
// about this state themselves. We ignore the return code to make
// sure everyone is inactivated regardless. The base input pin
// class can return an error if it has no allocator but Stop can
// be used to resync the graph state after something has gone bad
if (pPin->IsConnected()) {
HRESULT hrTmp = pPin->Inactive();
if (FAILED(hrTmp) && SUCCEEDED(hr)) {
hr = hrTmp;
}
}
}
}
#ifdef DXMPERF
PERFLOG_STOP( m_pName ? m_pName : L"CBaseFilter", (IBaseFilter *) this, m_State );
#endif // DXMPERF
m_State = State_Stopped;
return hr;
}
// override CBaseMediaFilter Pause method to activate any pins
// this filter has (also called from Run)
STDMETHODIMP
CBaseFilter::Pause()
{
CAutoLock cObjectLock(m_pLock);
// notify all pins of the change to active state
if (m_State == State_Stopped) {
int cPins = GetPinCount();
for (int c = 0; c < cPins; c++) {
CBasePin *pPin = GetPin(c);
if (NULL == pPin) {
break;
}
// Disconnected pins are not activated - this saves pins
// worrying about this state themselves
if (pPin->IsConnected()) {
HRESULT hr = pPin->Active();
if (FAILED(hr)) {
return hr;
}
}
}
}
#ifdef DXMPERF
PERFLOG_PAUSE( m_pName ? m_pName : L"CBaseFilter", (IBaseFilter *) this, m_State );
#endif // DXMPERF
m_State = State_Paused;
return S_OK;
}
// Put the filter into a running state.
// The time parameter is the offset to be added to the samples'
// stream time to get the reference time at which they should be presented.
//
// you can either add these two and compare it against the reference clock,
// or you can call CBaseFilter::StreamTime and compare that against
// the sample timestamp.
STDMETHODIMP
CBaseFilter::Run(REFERENCE_TIME tStart)
{
CAutoLock cObjectLock(m_pLock);
// remember the stream time offset
m_tStart = tStart;
if (m_State == State_Stopped){
HRESULT hr = Pause();
if (FAILED(hr)) {
return hr;
}
}
// notify all pins of the change to active state
if (m_State != State_Running) {
int cPins = GetPinCount();
for (int c = 0; c < cPins; c++) {
CBasePin *pPin = GetPin(c);
if (NULL == pPin) {
break;
}
// Disconnected pins are not activated - this saves pins
// worrying about this state themselves
if (pPin->IsConnected()) {
HRESULT hr = pPin->Run(tStart);
if (FAILED(hr)) {
return hr;
}
}
}
}
#ifdef DXMPERF
PERFLOG_RUN( m_pName ? m_pName : L"CBaseFilter", (IBaseFilter *) this, tStart, m_State );
#endif // DXMPERF
m_State = State_Running;
return S_OK;
}
//
// return the current stream time - samples with start timestamps of this
// time or before should be rendered by now
HRESULT
CBaseFilter::StreamTime(CRefTime& rtStream)
{
// Caller must lock for synchronization
// We can't grab the filter lock because we want to be able to call
// this from worker threads without deadlocking
if (m_pClock == NULL) {
return VFW_E_NO_CLOCK;
}
// get the current reference time
HRESULT hr = m_pClock->GetTime((REFERENCE_TIME*)&rtStream);
if (FAILED(hr)) {
return hr;
}
// subtract the stream offset to get stream time
rtStream -= m_tStart;
return S_OK;
}
/* Create an enumerator for the pins attached to this filter */
STDMETHODIMP
CBaseFilter::EnumPins(__deref_out IEnumPins **ppEnum)
{
CheckPointer(ppEnum,E_POINTER);
ValidateReadWritePtr(ppEnum,sizeof(IEnumPins *));
/* Create a new ref counted enumerator */
*ppEnum = new CEnumPins(this,
NULL);
return *ppEnum == NULL ? E_OUTOFMEMORY : NOERROR;
}
// default behaviour of FindPin is to assume pins are named
// by their pin names
STDMETHODIMP
CBaseFilter::FindPin(
LPCWSTR Id,
__deref_out IPin ** ppPin
)
{
CheckPointer(ppPin,E_POINTER);
ValidateReadWritePtr(ppPin,sizeof(IPin *));
// We're going to search the pin list so maintain integrity
CAutoLock lck(m_pLock);
int iCount = GetPinCount();
for (int i = 0; i < iCount; i++) {
CBasePin *pPin = GetPin(i);
if (NULL == pPin) {
break;
}
if (0 == lstrcmpW(pPin->Name(), Id)) {
// Found one that matches
//
// AddRef() and return it
*ppPin = pPin;
pPin->AddRef();
return S_OK;
}
}
*ppPin = NULL;
return VFW_E_NOT_FOUND;
}
/* Return information about this filter */
STDMETHODIMP
CBaseFilter::QueryFilterInfo(__out FILTER_INFO * pInfo)
{
CheckPointer(pInfo,E_POINTER);
ValidateReadWritePtr(pInfo,sizeof(FILTER_INFO));
if (m_pName) {
(void)StringCchCopyW(pInfo->achName, NUMELMS(pInfo->achName), m_pName);
} else {
pInfo->achName[0] = L'\0';
}
pInfo->pGraph = m_pGraph;
if (m_pGraph)
m_pGraph->AddRef();
return NOERROR;
}
/* Provide the filter with a filter graph */
STDMETHODIMP
CBaseFilter::JoinFilterGraph(
__inout_opt IFilterGraph * pGraph,
__in_opt LPCWSTR pName)
{
CAutoLock cObjectLock(m_pLock);
// NOTE: we no longer hold references on the graph (m_pGraph, m_pSink)
m_pGraph = pGraph;
if (m_pGraph) {
HRESULT hr = m_pGraph->QueryInterface(IID_IMediaEventSink,
(void**) &m_pSink);
if (FAILED(hr)) {
ASSERT(m_pSink == NULL);
}
else m_pSink->Release(); // we do NOT keep a reference on it.
} else {
// if graph pointer is null, then we should
// also release the IMediaEventSink on the same object - we don't
// refcount it, so just set it to null
m_pSink = NULL;
}
if (m_pName) {
delete[] m_pName;
m_pName = NULL;
}
if (pName) {
size_t namelen;
HRESULT hr = StringCchLengthW(pName, STRSAFE_MAX_CCH, &namelen);
if (FAILED(hr)) {
return hr;
}
m_pName = new WCHAR[namelen + 1];
if (m_pName) {
(void)StringCchCopyW(m_pName, namelen + 1, pName);
} else {
return E_OUTOFMEMORY;
}
}
#ifdef DXMPERF
PERFLOG_JOINGRAPH( m_pName ? m_pName : L"CBaseFilter",(IBaseFilter *) this, pGraph );
#endif // DXMPERF
return NOERROR;
}
// return a Vendor information string. Optional - may return E_NOTIMPL.
// memory returned should be freed using CoTaskMemFree
// default implementation returns E_NOTIMPL
STDMETHODIMP
CBaseFilter::QueryVendorInfo(
__deref_out LPWSTR* pVendorInfo)
{
UNREFERENCED_PARAMETER(pVendorInfo);
return E_NOTIMPL;
}
// send an event notification to the filter graph if we know about it.
// returns S_OK if delivered, S_FALSE if the filter graph does not sink
// events, or an error otherwise.
HRESULT
CBaseFilter::NotifyEvent(
long EventCode,
LONG_PTR EventParam1,
LONG_PTR EventParam2)
{
// Snapshot so we don't have to lock up
IMediaEventSink *pSink = m_pSink;
if (pSink) {
if (EC_COMPLETE == EventCode) {
EventParam2 = (LONG_PTR)(IBaseFilter*)this;
}
return pSink->Notify(EventCode, EventParam1, EventParam2);
} else {
return E_NOTIMPL;
}
}
// Request reconnect
// pPin is the pin to reconnect
// pmt is the type to reconnect with - can be NULL
// Calls ReconnectEx on the filter graph
HRESULT
CBaseFilter::ReconnectPin(
IPin *pPin,
__in_opt AM_MEDIA_TYPE const *pmt
)
{
IFilterGraph2 *pGraph2;
if (m_pGraph != NULL) {
HRESULT hr = m_pGraph->QueryInterface(IID_IFilterGraph2, (void **)&pGraph2);
if (SUCCEEDED(hr)) {
hr = pGraph2->ReconnectEx(pPin, pmt);
pGraph2->Release();
return hr;
} else {
return m_pGraph->Reconnect(pPin);
}
} else {
return E_NOINTERFACE;
}
}
/* This is the same idea as the media type version does for type enumeration
on pins but for the list of pins available. So if the list of pins you
provide changes dynamically then either override this virtual function
to provide the version number, or more simply call IncrementPinVersion */
LONG CBaseFilter::GetPinVersion()
{
return m_PinVersion;
}
/* Increment the current pin version cookie */
void CBaseFilter::IncrementPinVersion()
{
InterlockedIncrement(&m_PinVersion);
}
/* register filter */
STDMETHODIMP CBaseFilter::Register()
{
// get setup data, if it exists
//
LPAMOVIESETUP_FILTER psetupdata = GetSetupData();
// check we've got data
//
if( NULL == psetupdata ) return S_FALSE;
// init is ref counted so call just in case
// we're being called cold.
//
HRESULT hr = CoInitialize( (LPVOID)NULL );
ASSERT( SUCCEEDED(hr) );
// get hold of IFilterMapper
//
IFilterMapper *pIFM;
hr = CoCreateInstance( CLSID_FilterMapper
, NULL
, CLSCTX_INPROC_SERVER
, IID_IFilterMapper
, (void **)&pIFM );
if( SUCCEEDED(hr) )
{
hr = AMovieSetupRegisterFilter( psetupdata, pIFM, TRUE );
pIFM->Release();
}
// and clear up
//
CoFreeUnusedLibraries();
CoUninitialize();
return NOERROR;
}
/* unregister filter */
STDMETHODIMP CBaseFilter::Unregister()
{
// get setup data, if it exists
//
LPAMOVIESETUP_FILTER psetupdata = GetSetupData();
// check we've got data
//
if( NULL == psetupdata ) return S_FALSE;
// OLE init is ref counted so call
// just in case we're being called cold.
//
HRESULT hr = CoInitialize( (LPVOID)NULL );
ASSERT( SUCCEEDED(hr) );
// get hold of IFilterMapper
//
IFilterMapper *pIFM;
hr = CoCreateInstance( CLSID_FilterMapper
, NULL
, CLSCTX_INPROC_SERVER
, IID_IFilterMapper
, (void **)&pIFM );
if( SUCCEEDED(hr) )
{
hr = AMovieSetupRegisterFilter( psetupdata, pIFM, FALSE );
// release interface
//
pIFM->Release();
}
// clear up
//
CoFreeUnusedLibraries();
CoUninitialize();
// handle one acceptable "error" - that
// of filter not being registered!
// (couldn't find a suitable #define'd
// name for the error!)
//
if( 0x80070002 == hr)
return NOERROR;
else
return hr;
}
//=====================================================================
//=====================================================================
// Implements CEnumPins
//=====================================================================
//=====================================================================
CEnumPins::CEnumPins(__in CBaseFilter *pFilter,
__in_opt CEnumPins *pEnumPins) :
m_Position(0),
m_PinCount(0),
m_pFilter(pFilter),
m_cRef(1), // Already ref counted
m_PinCache(NAME("Pin Cache"))
{
#ifdef _DEBUG
m_dwCookie = DbgRegisterObjectCreation("CEnumPins", 0);
#endif
/* We must be owned by a filter derived from CBaseFilter */
ASSERT(pFilter != NULL);
/* Hold a reference count on our filter */
m_pFilter->AddRef();
/* Are we creating a new enumerator */
if (pEnumPins == NULL) {
m_Version = m_pFilter->GetPinVersion();
m_PinCount = m_pFilter->GetPinCount();
} else {
ASSERT(m_Position <= m_PinCount);